Shock From Costco

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joronimo

Active member
Jun 4, 2019
35
Phoenix, Az
Hey all, I need to buy more shock and saw Costco has a good deal on 24 lbs for $59.99. I usually use the Power Powder Pro from Leslises but Costco's Clorox Xtra Blue is a better price ($2.50/lb vs $2.75/lb). Any one have any experience with the Clorox? Is it better or worse, I see its a different chemical (sodium dichloro-s-triazinetrione) in the Clorox vs calcium hypochlorite in the Power Powder.

The Costco website (I know its advertising) says that it won't increase calcium hardness which we have a lot of already so I like that idea.

Any thoughts? Also any issues changing between chemical/shock types?
 
Weekly shocking is a pool store method and not used by TFP. If you follow TFP methods, there will be no need for the shock product. Don't buy. Read Pool School instead. Pool store methods and TFP methods are incompatible. You have to choose one or the other but not both. If you add dichlor, you are adding CYA which will get you in trouble. If you add cal hypo, you are adding Calcium which will get you in trouble (in AZ) due to high calcium fill water. You don't want to use either.
 
Right. Ok, so they are all correct but I will go ahead and answer your question.

The website is correct. Dichlor will not raise calcium, it raises CYA. Calcium buildup is bad, but CYA buildup can be far worse. In a desert climate with lots of evaporation and little rain both can become an issue quickly. All forms of solid chlorine come with something extra that will build up in your pool, calcium, CYA, or lithium (though lithium hypochlorite has become incredibly rare due to the global lithium supply being sought out for batteries).

As such we recommend liquid chlorine for most chlorination, it only adds salt which would have to build up to several thousand ppm to become a problem. And as said above, we don't play the pool store "weekly shocking" game as a pool cared for via TFPC simply has no need for it.

And welcome to TFP!
 
Steve_in_C said:
Weekly shocking is a pool store method and not used by TFP. If you follow TFP methods, there will be no need for the shock product. Don't buy. Read Pool School instead. Pool store methods and TFP methods are incompatible. You have to choose one or the other but not both. If you add dichlor, you are adding CYA which will get you in trouble. If you add cal hypo, you are adding Calcium which will get you in trouble (in AZ) due to high calcium fill water. You don't want to use either.
Click to expand...
TFP method is also cheaper!
 
ABCs of Pool Water Chemistry
Download the eBook from iTunes, etc.

Bleach and liquid chlorine are chemically identical.
Most household bleach is 6% sodium hypochlorite. Be aware that most also have additives. You do not want scented, splashless, fabric protection, or Cloromax.
Liquid chlorine is normally available with 10 or 12.5% sodium hypochlorite. Normally available at Walmart (pool section), Home Depot, Lowes, Pool Stores, etc. Be wary of liquid chlorine stored outside, as it degrades rapidly in elevated heat.
 

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You can use tablets ... IF!!! you understand what they are adding to your pool and that is acceptable.

They add CYA, which can build up and required higher levels of FC to keep the water sanitized and clear.
It is usually fine to use a few while on vacation, if your CYA is not already way too high.

Alternatively, you add a liquid chlorine injection system or switch to a SWG.
 
@joronimo I bought the large Clorox bucket of pucks at Costco a few months ago at the same time that I was reading this site to combat my high CYA from use of Trichlor pucks the Poll Builder told me to use. even though I had already opened the bucket of Costco pucks (hadn't used any) I took them back to Costco yesterday for a full refund. I've been using liquid chlorine from Walmart for the past month or so with fabulous results and about to convert to SWG.
 
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